What's an description for the rough & smooth er

Rough ER is involved in some protein production, protein folding, quality control and despatch. It is called ‘rough’ because it is studded with ribosomes

Smooth ER is associated with the production and metabolism of fats and steroid hormones. It is ‘smooth’ because it is not studded with ribosomes and is associated with smooth slippery fats.

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explanation:

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when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.